Process of making metallic brushes



(No Model.)

D. J. AHERN. PROCESS OF MAKING METALLIC BRUSHES. No. 410,479. Patented Sept. 3. 1889.

N4 PEYERS. wwmumo n hnr. Washington D. C.

UNITED STATES PATENT OFFICE.

DANIEL J. AHERN, OF BOSTON, MASSACHUSETTS.

PROCESS OF MAKING METALLIC BRUSHES.

SPECIFICATION forming part of Letters Patent No. 410,479, dated. September 3, 1889.

Application filed December 8, 1888. Serial No. 292,972. (No model.)

To all whom it may concern.-

Be it known that I, DANIEL J. AHERN, of Boston, in the county of Suffolk, State of Massachusetts, have invented a certain new and usefullmprovem ent in the Process of Making Metallic Brushes, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a top plan view of the mold employed in constructing my improved brush; Fig. 2, a side elevation of the same; Fig. 3, a top plan view of the mold, the nut being removed and a portion of the body broken away to show the interior; Fig. 4, a vertical transverse section taken on line 00 as in Fig. 3, and Fig. 5 a sectional view showing a portion of the completed brush.

Like letters and figures of reference indicate corresponding parts in the different figures of the drawings.

My invention relates particularly to that class of metallic brushes which are employed for cleaning boiler-tubes in metal working, &c.; and it consists in certain novel features, as hereinafter fully set forth and claimed, the object being to produce a simpler, cheaper, and more effective article of this character than is now in ordinary use.

The nature and operation of the improvement will be readily understood by all conversant with such matters from the following explanation.

In the drawings, A represents the mold considered as a whole, B the brush-rod, and O the wires or bristles.

The mold consists of a series of plates 0, which are triangular in cross-section, or so constructed that when in position for use they form a cylinder. The plates 1) have their ends disposed in two caps D E, which are respectively provided on their inner faces with an annular groove or socket (Z (see Fig. 4) adapted to receive them. The cap E is provided with a central opening f, adapted to re ceive the brush-rod B, and the cap D .with a large central opening g, (see Fig. 3,) provided with three inwardly-projecting studs or flanges 7a the space between theinner ends of said flanges being sufficiently large to admit the rod B, their purpose being to center said rod. Each plate 1) is provided with a series of laterally-arranged parallel slots 1' on one of its faces, said plates being so arranged in the caps that the slotted face of one plate engages or rests against the smooth face of the adjacent plate, as best shown in Fig. 2.

In constructing my improved brush the plates 1) are disposed, as described, in the caps D E, which leaves a central opening or chamber m, as shown in Fig. 4. which is screw-threaded on each end to receive the nuts K, is then passed through the opening f in the cap E and between the studs h in the opening g of the cap D, after which The brush-rod B,

said nuts are turned into said rod, there by securely holding the mold together. A group of wires 0 is then inserted in each slot '6 of the plates 1), the inner ends of said wires bearing against the rod B, as shown in Fig. 4. A nut K is now removed from its red B, exposing the opening g, through which molten metal H is poured into the chamber around the rod B and inner ends of the wires C. After the metal has cooled or hardened around the inner ends of the wires the caps D E are So The threaded ends of the rod 13 Brushes of this class as ordinarily constructed consist of a metallic tube divided longitudinally into sections and perforated, the wire bristles being inserted in the perforations and clinched on the inner side of the tube, after which the sections are united. 5

This method of constructing the brushes is slow and expensive. Moreover, the bristles are weakened by clinching them, rendering them liable to break and become detached from the body. My improved process obvi- 10o ates these objections and produces a cheaper and more effective device of this character.

It Will readily be seen that by changing the form of mold A and still employing plates 1),

provided with the Wire-slots, brushes of any desired shape may be constructed, the process described not being confined to forming the circular brushes shown.

Having thus explained my invention, what I claim is 1. The improved process of making metallic brushes, which consists in constructing a mold from separable plates provided with slots, inserting metallic bristles through said slots so that they project into the interior of the mold, filling said mold with molten metal, which hardens around the inner ends of said 

